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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
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Novel method for analyzing snellen visual acuity measurements.

Ninel Z Gregori1, William Feuer, Philip J Rosenfeld

  • 1Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida 33136, USA.

Retina (Philadelphia, Pa.)
|June 19, 2010
PubMed
Summary
This summary is machine-generated.

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Converting Snellen visual acuity to Early Treatment Diabetic Retinopathy Study (ETDRS) letter scores offers a more intuitive approach for statistical analysis than logarithm of the minimum angle of resolution (logMAR) units. This method enhances interpretability for clinicians while maintaining statistical validity.

Area of Science:

  • Ophthalmology
  • Clinical Research
  • Biostatistics

Background:

  • Retrospective reviews commonly convert Snellen visual acuity to logMAR units for statistical analysis.
  • LogMAR units lack intuitive interpretability for clinicians in routine practice.

Purpose of the Study:

  • To present an intuitive method for statistical analysis of visual acuity data.
  • To convert Snellen visual acuity to Early Treatment Diabetic Retinopathy Study (ETDRS) letter scores for enhanced interpretability.

Main Methods:

  • Snellen visual acuity measurements were converted to approximate ETDRS (approxETDRS) letter scores using the formula: 85 + 50 x log (Snellen fraction).
  • Data were converted back to Snellen equivalent fractions after statistical manipulation.
  • A linear relationship was established between true ETDRS, approxETDRS, and logMAR units.

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Last Updated: Jun 12, 2026

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05:14

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Main Results:

  • A linear relationship exists between true ETDRS, approxETDRS, and logMAR units.
  • Interconversion tables between Snellen, logMAR, and approxETDRS were created.
  • Statistical manipulation using approxETDRS scores yielded identical outcomes to logMAR conversions.

Conclusions:

  • Converting Snellen visual acuity to approxETDRS letter scores improves outcome interpretability for clinicians.
  • This approach offers a more intuitive alternative to logMAR units for statistical analysis in ophthalmology.